
Currently they are offering around 4 different programmes and each of them is shown at a special time. For example, the 4 PM show offers an 1 hour viewing and explanation about comets. Usually their programmes are start every 2 hours.
You can get the tickets at the machine in the entrance hall and most of the time there will be a staff member to help you if there`s a problem. The Comso-Planetarium lets you choose any seat you want, so I would recommend getting there 30 minutes earlier before the show starts if you want to have a good spot. (I recommend the ones in the back.) Also you can pull back every seat a little bit, so it feels like your actually laying under the stars.
There is a 20 minute explanation (in Japanese) during the viewing, but that's not really issue, to be honest and the talking time is a good opportunity to close your eyes and doze off for a few minutes.

In the end, it`s quite an adventure and it feels so real that I thought that any moment the seats would move and you could fly through the universe like a real cosmonaut.
The Cosmo-Planetarium is something for the whole family, for children every age, or if you want to go off somewhere to take a break from the chaotic city life.

Entrance fee: Adults 600 Yen,children 300 Yen, children under 3 years are free
Access: Shibuya Station: Yamanote Line(nearer to the exit), Hanzomon Line and Ginza Line; it's a 5 minute walk from the West Exit to the Shibuya Cultural Center Owada, the Planetarium is on the 12th floor.